Who knew Jeff Goldbum could tickle the ivory or even knew the words to Biz Markie's "Just a Friend?"

Since playing the piano on "Late Night," Jimmy Fallon informed the actor that the show has been getting tons of messages demanding that Goldblum do a duet with Markie, who was coincidentally hanging onstage with the Roots. And as weird as that request was, Goldblum simply obliged, hopped onto the piano bench and started playing a jazzed-up version of the 1989 hip-hop smash.

As entertaining as this pairing was, Fallon couldn't just sit on the sidelines. He joined the sing-along -- making this one late-night moment that no one will forget.

ENJOY!